Mix together plain yogurt, squeeze of lemon juice, garlic, cumin powder, crushed chilli flakes, turmeric, garam masala and a good pinch of salt - adjust the amount of flavouring to your own taste.
Place fish in a plastic bag and add the yogurt mix. Mix and marinate for 30 minutes.
Skewer the pieces of fish onto soaked wooden skewers.
Cook at 200°C/Gas Mark 6 for 10 minutes until cooked through or cook under hot grill turning occasionally until the fish is cooked through.
Serving suggestion - Serve with rice mixed with chopped coriander with mango chutney on the side